The investigation reveals shortcomings in the arguments of the Constitutional Court of Ukraine on the recognition of article 366-1 of the Criminal Code as not being in conformity with the Constitution, in terms of:(a) the court's lack of authority to criminalize socially dangerous acts; (b) lack of argumentation on the absence of social harm in the non-submission of a declaration and in the presentation of inaccurate information; (c) positive foreign experience; (d) conformity of article 366-1 of the Criminal Code of Ukraine with the principle of the rule of law. The article employs a set of legal research methods, including terminological, systemic-structural, formal-logical, and comparative-legal. It is stressed that:(a) the criminalization of a socially harmful act is a matter for the legislator, not the Constitutional Court of Ukraine, to decide; (b) the decision does not present or refute any argument on the element of social harmfulness relating to the non-submission of a declaration and the declaration of inaccurate information. On the basis of the investigation, it has been concluded that the decision of the Constitutional Court on the recognition of article 366-1 of the Criminal Code does not comply with the Constitution and has not been sufficiently substantiated.